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2019 The stepping stone model in a random environment and the effect of local heterogneities on isolation by distance patterns
Raphaël Forien
Electron. J. Probab. 24: 1-35 (2019). DOI: 10.1214/19-EJP314

Abstract

We study a one-dimensional spatial population model where the population sizes of the subpopulations are chosen according to a translation invariant and ergodic distribution and are uniformly bounded away from 0 and infinity. We suppose that the frequencies of a particular genetic type in the colonies evolve according to a system of interacting diffusions, following the stepping stone model of Kimura. We show that, over large spatial and temporal scales, this model behaves like the solution to a stochastic heat equation with Wright-Fisher noise with constant coefficients. These coefficients are the effective diffusion rate of genes within the population and the effective local population density. We find that, in our model, the local heterogeneity leads to a slower effective diffusion rate and a larger effective population density than in a uniform population. Our proof relies on duality techniques, an invariance principle for reversible random walks in a random environment and a convergence result for a system of coalescing random walks in a random environment.

Citation

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Raphaël Forien. "The stepping stone model in a random environment and the effect of local heterogneities on isolation by distance patterns." Electron. J. Probab. 24 1 - 35, 2019. https://doi.org/10.1214/19-EJP314

Information

Received: 5 July 2018; Accepted: 2 May 2019; Published: 2019
First available in Project Euclid: 13 June 2019

zbMATH: 07068788
MathSciNet: MR3968719
Digital Object Identifier: 10.1214/19-EJP314

Subjects:
Primary: 60F17, 60G99, 60H15, 60J25

JOURNAL ARTICLE
35 PAGES


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